Metamucil (sp?) makes these fiber wafers or biscuit-type things. They aren't as yummy as eating a cookie, but they are pleasant enough that you can eat them easily. I think Philips Milk of Magnesia also makes small pills that are like the size of a baby aspirin so those go down easily.
I've also heard good things about apple or prune juice-that they can help get things moving. Unfortunately I can't get prune juice past my lips and apple juice never had that effect on me.
Jennifer